code: def config_path(self):
      return None
  
file_path: mmf/mmf/models/top_down_bottom_up.py
imports: import torch
  from mmf.common.registry import registry
  from mmf.models.base_model import BaseModel
  from mmf.modules.layers import ReLUWithWeightNormFC
label_desc: Use image node_id 2 for calling the TopDownBottomUp obj's underlying member method code with example usage: obj.config_path() and returns: None